Cutter head for last-turning lathes and supports therefor



March 13, 1928. v

V J. E. COVILLE CUTTER HEAD FOR LAST TURNING LATHES AND SUPPORTS THEREFOR Filed Ari], a, 1926 2 Sheets-Sheet 1 March 13, 1928. 1,662,375

J. E. COVILLE CUTTER HEAD FOR LAST TURNING LATHES AND SUPPORTS THEREFOR Filed April 8. 1926 2 Sheets-Sheet 3 i? 1v fiwanl'or: JbhnE. Camille,

Patented Mar. 13, 1928.

UNITED STATES PATENT orrica.

JOHN E. COVILLE, OF SWAMPSCOTT, MASSACHUSETTS, ASSIGNOR OF ONE-THIRD T THEODORE W. MONICHOL AND ONE-THIRD TO THOMAS T. McNICI-IOL, BOTH OF SWAMPSCOTT, MASSACHUSETTS.

CUTTER HEAD FOR LAST-TURNING LATHES AND SUPPORTS THEREFOR.

Application filed April 8,

This invention relates to rotary cutters and supports therefor for use in lathes for shaping lasts and other irregularly shaped articles, the objects being to produce a well balanced cutter having means for removing superfluous stock from the block prior to the actual shaping thereof, the provision of means for accurately centering the cutter with the 1nodel-contacting wheel, the provision of means whereby the model-contacting wheel and the cutter may be adjusted toward and from each other, the provision of means whereby the cutter may be mounted directly upon the shaft of an electric motor, and means whereby the weight of the motor may be accurately balanced in order that the cutter-supporting frame may freely reciprocate. p

These objects are attained by the mechanisms illustrated in the accompanying draw mas. I p

For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and the invention is not limited to the precise arrangement and organi-' zation of these instrumentalities as herein shown and described except as required by the scope of the appended claim.

0f the drawings:

Figure 1 represents a front elevation of a portion of a lathe for shaping lasts and the like and showing mechanism embodying the principles of the present invention.

Figure 2 represents a horizontal section of same on line 2, 2 on Fig. 1, drawn to a reduced scale.

Figure 3 represents a plan of the modelcontacting wheel and its support.

Figure 4 represents an end elevation of the cutter head.

Figure 5 represents a section of same-on, line 5, 5 on Fig. 4, and f Figure 6 represents a. section on line 6, 6 on Fig. 5. I

Similar characters indicate like parts throughout the several figures of the drawm s.

in the drawings 10 is: a portion of a. frame of a lathe for shaping lasts and the likeon 1926. Serial No. 100,729.

the upper part of which is a guide rib 11 at the rear and two shorter guide ribs 12, 13 at the front thereof.

The adjacent ends of the ribs 12, 13overlap as shown in Fig. 2.

On the guide ribs 11 and 12 is slidably mounted the frame 14 provided with a later ally extending arm 15 to the outer end of which is secured an. electric motor 16 to which current is supplied through the cable 17 extending from. a switch 18 on the frame 10.

The revoluble shaft 19 of the motor 16 extends lengthwise of the arm15 and rotates in a bearing 20 formed upon said arm.

The shaft 19 has a cone-shaped portion 21 on which is mounted the block 22 forming part of the cutter head: i

To balance the weight of the motor 16 extending from one end of the frame 14, an arm 23is secured at 23 to the frame 14: and has on its outer end a weight 24 which may be adjusted lengthwise of said arm and secured in adjusted position by means of set screw 25. WVhen said weighthas been properly adjusted on the arm. 23 the frame 14 will be prevented from tilting and will slide freely on the guide ribs 11, 12.

' On the ribs 11, 13 is slidably mounted another frame 26 which is L-shaped in plan and has a vertical plate 27 extending upwardly therefrom, said plate having parallel horizontal guides 28 on one face.

A block 29 is movable horizontally on these guides 28 toward and from the back of the machine and is clamped in adjusted position by the set screw 30.

The block 29 has a dove-tailed slot extending from topto bottom thereof and in which is mounted a plate 31 adapted to be clamped to the block 29 in adjusted position by means of set screw 32. p

This plate 31 has revolubly mounted thereon the pattern wheel. 33 which coacts with model on the lathe in the usual manner.

To the frame 26 is pivoted a bar 34 while another bar 35 is pivoted to the frame it, the free ends of these bars. overlapping within a tubular member 36 provided with a clamp screw 37 by which the bars 34-, 35 may be locked together.

For different sizes of work it is desirable to vary the distance between the pattern wheel 33 and cutter head and this can be quickly accomplished by releasing the clamp screw 37 adjusting the frames let, 26 toward or from each other as desired and then when the proper adjustment has been made again locking together the bars 3-1, by means of set screw 37.

The two frames 1 1, 26 may then be moved in unison. along the guide bars 11, 12 and 13 by any suitable mechanism.

As this means forms no part of the present invention it is believed that it is unnecessary to illustrate the same, and the same is true of the swinging frame carrying the model and the wooden blocks to be shaped.

By means of the adjustable members on the plate 27 the pattern wheel 33 may be centered with the axis of the shaft 19.

The block 22 of the cutter head has four radial slots 10 in its outer end and a cylindrical hub ll on its inner end.

In each radial slot is a cutting blade 42 and through each blade extends a bolt 43 having a head at on its outer end.

The slots 40 are of difierent depths so that the cutting blades therein will be in ditferent planes.

The opposite end of each bolt 43 is threaded and extends through an annular plate 45 surrounding the hub 41 and movable endwise thereof.

Each threaded end has a clamping nut 46 thereon.

The block 22 has a reduced cylindrical portion 47 on which is mounted two eccentric rings 18, -19 which are provided with spanner holes by which said rings may be adjusted about the axis of said block 22.

These rings 48, 49 are larger and have greater weight on one side than on the other and may be adjusted about the block 22 to counter balance the weight of the longer and heavier cutter blades 42 so that the head may rotate more evenly.

When the eccentric rings 48 49 have been properly adjusted they are clamped in adjusted position by the annular plate d5 being forced against them by means of the nuts -46.

It will be noted that the combined thickness of the two plates 48, -19 is greater than the width of the cylindrical portion 47 and consequently they may be forced by said plate 45 and nuts l6 into such firm contact with the shoulder 51 that they cannot be moved about the axis of shaft 19 until again released by unscrewing the nuts 16.

The extreme outer end of shaft 19 is threaded and has mounted thereon the nut 52, having on its inner end an annular flange 53 which extends into a socket in the block 22 and bears against the end wall thereof, thereby forcing said block further on the cone portion 21 of the shaft 19.

The nut 52 has two scoring blades 55 formed integral therewith which act upon the work ahead of the cuttin blades 42, removing parts of the wooden blocks and permitting the actual shaping of the lasts to be more readily acconiplished by the cutting blades The nut is so threaded to the Shaft that when the blades 55 come into contact with the work the strain thereon will tend to screw the nut further on the shaft and at the same time crowd the block further on the cone portion 21.

The block 22 is provided with threaded holes 56 to receive screws forming a part of a tool by which said block may be withdrawn from the tapered portion 21 of the shaft 19.

This tool forms no part oi the present invention and therefore is not. shown or described.

lly placing the cutter head directly upon the shaft of an electric motor many elements usually found in a machine of this class are dispensed with and the mechanism greatly simplified.

The mechanism is further simplified by mounting the cutter actuating motor on the same slidable frame which carries the cutter head.

By providing the cutter head with the balancing rings 48, 49 the cutter head will rotate evenly.

Moreover, the means of securing the cutter head to the rotating driving shaft is greatly simplified in applicants construe tion.

By providing the scoring blades 55 much of the material of the work may be removed before the cutting and shaping blades come into operation.

By this construction of cutter head and its support it is possible to position the driving shaft 19 parallel with the axis of the rotating work being operated upon.

The simplification of these various mechanisms greatly reduces the cost of manufacture and by reducing to a minimum the number of movable parts there are fewer elements to get out of order and interfere with the proper operation of the lathe.

It is believed that the operation and many advantages of the invention will be understood readily without further description.

Having thus described my inventionfl' claim:

In a lathe for shaping lasts and the like having a supporting bed provided with a pair of upwardly extending guide ribs, a slidablc frame resting on and movable endwise of said ribs and having uprights at the opposite ends thereof, a long arm secured to said uprights and projecting a considerable distance beyond one end of the slidable frame, said arm having a flat vertical face at the outer end thereof; a motor secured to the flat face at outer end of said arm; a

rotary shaft centrally disposed in said motor with a bearing on said arm and driven directly by said motor; a cutter secured directly to the end of said shaft between said uprights; a bar secured at one end to the uprights of said slidable frame and extending downwardly and outwardly from the opposite end of said slidable frame beneath said supporting bed; and a Weight adjustably secured to the end of said bar and adapted to counterbalance the weight of said arm and motor and prevent said slidable frame being tilted.

Signed by me at 746 Old South Bldg, Boston, Mass, this 9th day of March, 1926.

JOHN E. COVILLE. 

